Frequently Asked Questions
Due to the pipe's inherent flexibility and it's availability in 50 metre coils, polybutylene pipe can be bent easily around obstructions or through studs and plates with the minimum use of fittings. Care should be taken not to kink or damage the pipe. It is recommended that the minimum bending radius be 10 times the outside diameter of the pipe. If this is not possible an Iplex
Pro-fit® elbow should be used. If for any reason the pipe is kinked or damaged, the faulty section should be cut out and replaced.
a) Timber framework? Holes drilled in studs or plates etc. shall be accurately sized to allow longitudinal movement of the pipe through the hole with a minimum clearance of 2mm on the pipes diameter. A 25mm spade bit is suitable for both sizes of pipe. Please note that the use of silicon in the holes is not required.
b) Metal framework? Holes drilled in metal studs or plates etc. shall be accurately sized to enable suitable sized grommets, lagging or a short sleeve of oversized pipe to be firmly secured in the framework. This is to allow free movement of the pipe through the grommet, lagging or sleeve without any direct contacts between pipe and framework.
As the lineal thermal expansion rate of PB pipe is approximately 13mm for every 10°C temperature change for each 10 metres of pipe, care must be taken with the installation to allow for this potential movement of the pipe. PB pipe should not be pulled tight between fixed points as this will prohibit movement if the pipe contracts, and result in excessive tensile forces on joints and fittings. Allow 10mm slack per metre of pipe. Expansion can usually be accommodated by the pipe's flexibility.
As per AS/NZS 3500 parts 1&4 or local authority requirements:- Pipes in chases shall be continuously wrapped with an impermeable flexible material. Ducts shall be fitted with removable covers. Conduits embedded in walls or floors shall comply with the requirements of the appropriate building authority. Iplex Pro-fit® pipe is available pre-lagged in a light duty polyethylene sleeve.
Pro-Fit® pipe may be installed under concrete slabs in accordance with AS/NZS 3500 parts 1 & 4, or local authority requirements. When Pro-Fit® penetrates the slab it shall be at right angles to the surface of the slab and shall be lagged with an impermeable, flexible plastics material of not less than 6mm thickness for the full depth of the slab penetration i.e. PVC conduit or pressure pipe.
The use of pipe clips should be in accordance with AS/NZS3500 parts 1&4 and in keeping with good plumbing practice. The following table is based on AS/NZS 3500.
Iplex Pro-Fit® PB pipe is available for recycled water. Coloured purple, with the wording "recycled water do not drink" printed along its length.
If the system is to be exposed to sunlight beyond the normal construction periods, the pipe should be protected from sunlight (UV) damage.
The 16mm K2® tool can be used to crimp the 18mm Pro-Fit® fittings. The other sizes are not compatible.